/*******************************************************************************
 * Copyright 2017 Bstek
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License.  You may obtain a copy
 * of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
 * License for the specific language governing permissions and limitations under
 * the License.
 ******************************************************************************/
package com.bstek.urule.dsl;

import org.antlr.v4.runtime.BaseErrorListener;
import org.antlr.v4.runtime.RecognitionException;
import org.antlr.v4.runtime.Recognizer;

/**
 * @author Jacky.gao
 * @since 2015年5月11日
 */
public class ScriptDecisionTableErrorListener extends BaseErrorListener {
    private StringBuffer sb;

    @Override
    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol,
                            int line, int charPositionInLine,
                            String msg, RecognitionException e) {
        if (sb == null) {
            sb = new StringBuffer();
        }
        sb.append("[" + offendingSymbol + "] is invalid:" + msg);
        sb.append("\r\n");
    }

    public String getErrorMessage() {
        if (sb == null) {
            return null;
        }
        return sb.toString();
    }
}
